A study was conducted to evaluate the impact of taking a nutritional supplement

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A study was conducted to evaluate the impact of taking a nutritional supplement on a person's reaction time One hundred volunteers were placed into one of three groups according to their athletic ability: low, moderate, or high. Participants in each group were randomly assigned to take either the nutritional supplement or a placebo for six weeks. At the end of the six weeks, participants were given a coordination task. The reaction time in completing the task was recorded for each participant. The study compared the reaction times between those taking the supplement and those taking the placebo within each athletic ability level. Which of the following is the best description of the study? (A) A randomized block design (B) A completely randomized design (C) A matched-pairs design (D) A randomized observational study (E) A stratified observational study 2. A compact disc (CD) manufacturer wanted to determine which of two different cover designs for a newly released CD will generate more sales. The manufacturer chose 70 stores to sell the CD. Thirty-five of these stores were randomly assigned to sell CDs with one of the cover designs and the other 35 were assigned to sell the CDs with the other cover design. The manufacturer recorded the number of CDs sold at each of the stores and found a significant difference between the mean number of CDs sold for the two cover designs. Which of the following gives the conclusion that should be made based on the results and provides the best explanation for the conclusion? (A) It is not reasonable to conclude that the difference in sales was caused by the different cover designs because this was not an experiment. because there was no control group for comparison. because the 70 stores were not randomly chosen. cover designs were randomly assigned to stores. sample size was large (B) It is not reasonable to conclude that the difference in sales was caused by the different cover designs (C) It is not reasonable to conclude that the difference in sales was caused by the different cover designs (D) It is reasonable to conclude that the difference in sales was caused by the different cover designs because the (E) It is reasonable to conclude that the difference in sales was caused by the different cover designs because the 3. In the design of a survey, which of the following best explains how to minimize response bias? (A) Increase the sample size (B) Decrease the sample size (C) Randomly select the sample. (D) Increase the number of questions in the survey (E) Carefully word and field-test survey questions

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3) Response bias (also called survey bias) is the tendency of a person to answer questions on a survey untruthfully or misleadingly. For example, they may feel pressure to give answers that are socially acceptable

E option

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